diff --git a/src/web/app/common/scripts/generate-default-userdata.ls b/src/web/app/common/scripts/generate-default-userdata.ls
index de03e96151..c13d221bb9 100644
--- a/src/web/app/common/scripts/generate-default-userdata.ls
+++ b/src/web/app/common/scripts/generate-default-userdata.ls
@@ -22,6 +22,7 @@ module.exports = ~>
 	data =
 		cache: true
 		debug: false
+		nya: true
 		home: home-data
 
 	return data
diff --git a/src/web/app/common/scripts/i.ls b/src/web/app/common/scripts/i.ls
index 5f3c016f8a..888ef194d0 100644
--- a/src/web/app/common/scripts/i.ls
+++ b/src/web/app/common/scripts/i.ls
@@ -14,3 +14,5 @@ module.exports = (me) ->
 			if data?
 				Object.assign me, data
 			me.trigger \updated
+
+		me: me
diff --git a/src/web/app/common/scripts/text-compiler.js b/src/web/app/common/scripts/text-compiler.js
index 9915e3335f..41f4966682 100644
--- a/src/web/app/common/scripts/text-compiler.js
+++ b/src/web/app/common/scripts/text-compiler.js
@@ -1,3 +1,5 @@
+const riot = require('riot');
+
 module.exports = function(tokens, canBreak, escape) {
 	if (canBreak == null) {
 		canBreak = true;
@@ -5,7 +7,10 @@ module.exports = function(tokens, canBreak, escape) {
 	if (escape == null) {
 		escape = true;
 	}
-	return tokens.map(function(token) {
+
+	const me = riot.mixin('i').me;
+
+	let text = tokens.map(function(token) {
 		switch (token.type) {
 			case 'text':
 				if (escape) {
@@ -27,4 +32,10 @@ module.exports = function(tokens, canBreak, escape) {
 				return '<a>' + token.content + '</a>';
 		}
 	}).join('');
+
+	if (me && me.data && me.data.nya) {
+		text = text.replace(/な/g, 'にゃ');
+	}
+
+	return text;
 }
diff --git a/src/web/app/desktop/tags/settings.tag b/src/web/app/desktop/tags/settings.tag
index c6c0340912..2a0db236a7 100644
--- a/src/web/app/desktop/tags/settings.tag
+++ b/src/web/app/desktop/tags/settings.tag
@@ -58,6 +58,10 @@ mk-settings
 				input(type='checkbox', checked={ I.data.debug }, onclick={ update-debug })
 				p 開発者モード
 				p デバッグ等の開発者モードを有効にします。
+			label.checkbox
+				input(type='checkbox', checked={ I.data.nya }, onclick={ update-nya })
+				p <i>な</i>を<i>にゃ</i>に変換する
+				p 攻撃的な投稿が多少和らぐ可能性があります。
 
 		section.signin(show={ page == 'signin' })
 			h1 ログイン履歴
@@ -253,3 +257,11 @@ script.
 				debug: @I.data.debug
 		.then ~>
 			@update-i!
+
+	@update-nya = ~>
+		@I.data.nya = !@I.data.nya
+		@api \i/appdata/set do
+			data: JSON.stringify do
+				nya: @I.data.nya
+		.then ~>
+			@update-i!